I’ve been by there many times traveling, and it doesn’t appear to be a homeless campground, those are more in the downtown area. This section is 85 SB/NB on Pidemont and Buford Connector, very loud area.
More info (for those interested)
https://www.reddit.com/r/Atlanta/
Thanks. I saw the area on street view before your post. Lots of fuel there. It will be interesting to see how the fire started.